The A16-250 with PTC Resettable Fuses Through Hole RoHS manufactured by JDT is an electronic component used in circuits to protect against excessive current. It is a resettable fuse consisting of two cylindrical parts which have a PTC (positive temperature coefficient) polymer as the active component. When excessive current is drawn through the fuse, it will heat up and expand, breaking the circuit and protecting the components connected to it. Once it has tripped, the fuse can be reset by allowing it to cool, and the circuit will be re-established. The A16-250 is RoHS compliant, meaning it does not contain hazardous substances such as lead and mercury. It has a rated current of 16A and a hold current of 25A, which is the highest current it will carry without tripping.